Denisyuk hologram

Denisyuk hologram

[′den·ə·syu̇k ′häl·ə‚gram]
(optics)
A type of hologram that can be viewed in ordinary white light through use of the depth dimension of the emulsion.
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This latest laser technology has been incorporated into AuroraOne (a new laser head product) to record a Denisyuk hologram.
Professor Yuri Denisyuk, inventor of the eponymous volume, or white-light reflection hologram, otherwise known as a Denisyuk hologram, died peacefully in hospital in St Petersburg on May 14, at the age of 88.
But it is volume holograms that have the power to reproduce reality more accurately and which can still elicit from a person viewing their first Denisyuk hologram the question 'Where is it?'.
The sensitivity of the emulsion means relatively short exposure times: they quote 20 seconds for a 30 x 40 cm Three-colour Denisyuk hologram with the 20mW HeNe the lowest power of the lasers.
It was not until the late 1980s, in the Soviet Union, that the goal of recording Denisyuk holograms which displayed the colours of the object as accurately as possible began to emerge--made possible by the arrival of suitable lasers and also panchromatic recording materials (ie.
The exhibition also featured Russian and Ukrainian monochrome Denisyuk holograms, colour analogue holograms, pseudo-colors, multiplex stereograms, and digital holograms from Geola uab (Lithuania).
It is a well-displayed and arranged collection of around 100 display holograms, showing the history of the medium from early examples of monochrome Denisyuk holograms of items from museums in Russia, Ukraine and Belarus to recent full-colour Denisyuk and digital holograms.
In the display session, Hans Bjelkhagen described the Virtual Artifacts Exhibition project in the UK, where analogue colour reflection Denisyuk holograms were used instead of the real artefacts for arranging a touring exhibition of rare art objects.
Its silver halide holograms are primarily Denisyuk holograms of treasures from the National Museum and Art Gallery, and it has mounted several exhibitions of these works.
Bjelkhagen focussed on the use of single-beam Denisyuk holograms. These can be exposed by a laser beam conducted through an optical fibre contained within the endoscopic bundle used for internal examination of a live animal or person.